Calculate the variance of 2, 4, 7, 8 and 9
x
2
4
7
8
9
(\(\bar{x} - \bar{x}\))
-4
-2
1
(\(\bar{x} - \bar{x})^2\)
16
_________
\(\sum (x - x)^2\) = 34
\(\bar{x} = \frac{2 + 4 + 7 + 8 + 9}{5} = 6
variance = \(\frac{34}{5}\)
= 6.8
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